Dig this;
More reasons to buy those crappy Wolfbrights or whatever they are 
Good news non the less.
Later,
Keith
very interesting
I saw that and also considered starting a thread on it
I would assume the PWM rate will have to be quite precise, if it does work in humans
So now, a flashlight can advertise their special modes as: Tactical Strobe, Signaling Beacon, SOS, and Alzheimer therapy.